3. Appendix (to be carried out by qualified personnel only)

3.1 Mains 2 line protection

The rating of the mains 2 line upstream protection circuit-breaker must be chosen:

to protect the static switch thyristors with respect to maximum permissible currents. Refer to the table opposite for a 400 V mains 2 voltage;

to ensure discrimination with respect to the UPS output fuses (refer to fuse time-current curves below) and to the downstream protective devices.

rated inverter output (kVA)

maximum permissible current

800

19 In for 20 ms

900

19 In for 20 ms

t(s)

 

 

 

104

 

 

 

103

 

 

 

102

 

 

 

101

 

 

 

1

 

 

 

10-1

 

 

 

10-2

 

 

 

10-3

 

 

 

10-4

104

105

I(A)

103

Time-current curve 1600 A fuse

34006451EN/AC - Page 31

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Image 31
APC 9000 installation manual Mains 2 line protection, Rated inverter output kVA Maximum permissible current